Setup Guide
4 min read

Domain Health

Your domain health checklist:
3 things to check right now

The overview page explained the three pillars. This page is your diagnostic checklist — the specific signals to check right now, what “healthy” vs “damaged” looks like for each, and exactly what to do when something is wrong.
What you’ll learn
  • The three signals that determine your domain health
  • How to check each one using free tools (including QEV’s)
  • What a drop in health means and what to do about it
  • The re-verification connection: stale lists are the #1 health killer

Three signals that determine your domain health

Signal 1
Authentication
Authentication records (SPF, DKIM, DMARC) set up and passing. Proves you are who you say you are.
Signal 2
Blacklist Status
Not listed on Spamhaus, Barracuda, or other major blocklists.
Signal 3
Sending Reputation
Low bounce rate (few emails bouncing back), low spam complaints, consistent sending patterns.

Healthy domain vs damaged domain

Healthy domain
AuthenticationAll passing ✓
BlacklistsNot listed ✓
Bounce rate<1%
Spam complaints<0.1%
Sender reputationHigh
Damaged domain
AuthenticationSPF/DKIM failing ✗
BlacklistsListed on 2 ✗
Bounce rate4.8%
Spam complaints0.5%
Sender reputationLow

When your health drops: the re-verification connection

The most common cause of domain health drops is list quality degradation. Email addresses go stale — roughly 2-3% stop working every month. If you verified 90 days ago and haven’t re-verified, up to 9% of your list may now be invalid. Send to those addresses and your bounce rate spikes, complaints rise, and your reputation drops.

The fix: Re-verify your list with QEV. Remove the addresses that have gone stale since your last verification. Your bounce rate drops, complaints decrease, and your domain health recovers.

This is the cycle: verify → send → monitor health → health drops? → re-verify → repeat.

When was the last time you verified your list?
If it’s been more than 60-90 days, your list has gone stale.

Re-Verify Your List →

Check your domain health now

Use these free tools to check each health signal:

SPF
SPF Analyzer
Check your SPF record
Free
DK
DKIM Analyzer
Check your DKIM signature
Free
DM
DMARC Analyzer
Check your DMARC policy
Free
BL
IP Blacklist Checker
Check major blocklists
Free

For sending reputation specifically, use Google Postmaster Tools (free, from Google). It shows your domain’s reputation, spam rate, and authentication status directly from Gmail’s perspective.

Domain Health — Quick Reference
3 signals
Authentication (SPF/DKIM/DMARC) + Blacklist status + Sending reputation
#1 cause of drops
Stale lists → bounces → reputation damage. Fix: re-verify every 60-90 days.
Check now
Authentication · Blacklists · Reputation
The cycle
Verify → send → monitor → health drops? → re-verify → repeat
quickemailverification.com/learn/setup

Healthy domains start with clean lists.

Verify free — 3,000 emails, no credit card.

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